Towel rack support arm



FIG. 1 is the perspective view of a towel rack support arm showing my new design;

FIG. 2 is the front elevational view thereof;

FIG. 3 is the rear elevational view thereof;

FIG. 4 is the top plan view thereof;

FIG. 5 is the bottom plan view thereof;

FIG. 6 is the left side elevational view thereof; and,

FIG. 7 is the right side elevational view thereof. 

The ornamental design for a towel rack support arm, as shown and described. 